Yes, I can make testmission on Altis or Stratis, and if the loading works without problems, the problem must be on that terrain. I can also try to pack that savefile 30MB (packed size 6MB) and attach it to this conversation.

I have the unlimited saves enabled, so the issue is something else. I have built test mission, and I assume that this is a memory issue, because 20MB savefile can be loaded, but when size of file is over 30-40MB loading of file fails. Can the issue be in a mod-map called "Valtatie 5 (VT5)" that I'am using?